Distributed pod wing modeling and aeroelastic analysis

分布式吊舱机翼建模与气动弹性分析

Science and Technology on Rotorcraft Aeromechanics Laboratory, CHRDI, Jingdezhen 333001, China

Received: 14 December 2021

Abstract

基于准线性化隐式建模方法, 建立适用于大展弦比机翼的动力学模型, 研究分布式吊舱机翼的气动弹性特点。其中结构模型采用中等变形梁模型, 气动模型采用准定常理论, 利用小扰动和有限差分法, 建立求解机翼气弹稳定性的方法。在验证结构和气动模型准确性基础上, 研究吊舱的个数、质量、展向站位、弦向/法向偏置等参数对分布式吊舱机翼气动特性的影响。分析结果发现: 吊舱越靠近机翼中部、弦向和法向偏置越大机翼稳定性越高, 但质量分布不均时反而会降低稳定性; 机翼经历了振动收敛、单频简谐振动和倍频简谐振动, 其颤振形式为面内外弯曲和扭转耦合, 三维效应显著。文中的方法能够有效描述分布式吊舱机翼的气动弹性特性。

摘要

Based on the quasi-linearized implicit aeroelastic modeling method, the aeroelastic dynamics model for high-aspect ratio wing was established to study the aeroelastic characteristics. The structural model adopts the moderately deformed beam model, the aerodynamic model adopts the quasi-steady theory, and the small perturbation and finite difference method are used to establish the method to solve the aeroelastic stability of the wing. On the basis of verifying the accuracy of the structure and aerodynamic model, the influences of the number, mass, spanwise position, chord/vertical bias and other parameters on the aerodynamic characteristics of the distributed pod wing are studied. The results show that the closer the pod is to the middle of the wing, the greater the chord and vertical bias is, the higher the wing stability will be, but the uneven mass distribution will reduce the stability; the wing has experienced vibration attenuation, single-frequency harmonic vibration and multi-frequency periodic vibration, the fuller mode is the coupling of in-plane bending and out of plane bending and torsional motion, and the three-dimensional effect is significant. The method presented in this paper can effectively describe the aeroelastic characteristics of distributed pod wing.